pnp.c

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/*
 * PROJECT:         ReactOS Kernel
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            ntoskrnl/fsrtl/pnp.c
 * PURPOSE:         Manages PnP support routines for file system drivers.
 * PROGRAMMERS:     Pierre Schweitzer
 */
 
/* INCLUDES ******************************************************************/
 
#include <ntoskrnl.h>
#include <ioevent.h>
#define NDEBUG
#include <debug.h>
 
/* PUBLIC FUNCTIONS **********************************************************/
 
/*++
 * @name FsRtlNotifyVolumeEvent
 * @implemented
 *
 * Notifies system (and applications) that something changed on volume.
 * FSD should call it each time volume status changes.
 *
 * @param FileObject
 *        FileObject for the volume
 *
 * @param EventCode
 *        Event that occurs one the volume
 *
 * @return STATUS_SUCCESS if notification went well
 *
 * @remarks Only present in NT 5+.
 *
 *--*/
NTSTATUS
NTAPI
FsRtlNotifyVolumeEvent(IN PFILE_OBJECT FileObject,
                       IN ULONG EventCode)
{
    NTSTATUS Status;
    LPGUID Guid = NULL;
    PDEVICE_OBJECT DeviceObject = NULL;
    TARGET_DEVICE_CUSTOM_NOTIFICATION Notification;
 
    Status = IoGetRelatedTargetDevice(FileObject, &DeviceObject);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }
 
    Status = STATUS_INVALID_PARAMETER;
 
    Notification.Version = 1;
    Notification.Size = sizeof(TARGET_DEVICE_CUSTOM_NOTIFICATION);
    /* MSDN says that FileObject must be null
       when calling IoReportTargetDeviceChangeAsynchronous */
    Notification.FileObject = NULL;
    Notification.NameBufferOffset = -1;
    /* Find the good GUID associated with the event */
    switch (EventCode)
    {
        case FSRTL_VOLUME_DISMOUNT:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_DISMOUNT;
            break;
        }
        case FSRTL_VOLUME_DISMOUNT_FAILED:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_DISMOUNT_FAILED;
            break;
        }
        case FSRTL_VOLUME_LOCK:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_LOCK;
            break;
        }
        case FSRTL_VOLUME_LOCK_FAILED:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_LOCK_FAILED;
            break;
        }
        case FSRTL_VOLUME_MOUNT:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_MOUNT;
            break;
        }
        case FSRTL_VOLUME_UNLOCK:
        {
            Guid = (LPGUID)&GUID_IO_VOLUME_UNLOCK;
            break;
        }
    }
    if (Guid)
    {
        /* Copy GUID to notification structure and then report the change */
        RtlCopyMemory(&(Notification.Event), Guid, sizeof(GUID));
 
        if (EventCode == FSRTL_VOLUME_MOUNT)
        {
            IoReportTargetDeviceChangeAsynchronous(DeviceObject,
                                                   &Notification,
                                                   NULL,
                                                   NULL);
        }
        else
        {
            IoReportTargetDeviceChange(DeviceObject,
                                       &Notification);
        }
 
        Status = STATUS_SUCCESS;
    }
    ObDereferenceObject(DeviceObject);
 
    return Status;
}